Don't remove all mappings of a swapped out process if the vm map contained

wired entries.  vm_fault_unwire() depends on the mapping being intact.

Reviewed by:	dillon

1 files changed, 5 insertions, 1 deletions

diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index be7df98..76920a0 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -544,6 +544,7 @@ vm_pageout_map_deactivate_pages(map, desired)
 {
 	vm_map_entry_t tmpe;
 	vm_object_t obj, bigobj;
+	int nothingwired;
 
 	GIANT_REQUIRED;
 	if (lockmgr(&map->lock, LK_EXCLUSIVE | LK_NOWAIT, (void *)0, curthread)) {
@@ -551,6 +552,7 @@ vm_pageout_map_deactivate_pages(map, desired)
 	}
 
 	bigobj = NULL;
+	nothingwired = TRUE;
 
 	/*
 	 * first, search out the biggest object, and try to free pages from
@@ -566,6 +568,8 @@ vm_pageout_map_deactivate_pages(map, desired)
 				bigobj = obj;
 			}
 		}
+		if (tmpe->wired_count > 0)
+			nothingwired = FALSE;
 		tmpe = tmpe->next;
 	}
 
@@ -592,7 +596,7 @@ vm_pageout_map_deactivate_pages(map, desired)
 	 * Remove all mappings if a process is swapped out, this will free page
 	 * table pages.
 	 */
-	if (desired == 0)
+	if (desired == 0 && nothingwired)
 		pmap_remove(vm_map_pmap(map),
 			VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS);
 	vm_map_unlock(map);